Fax Concerns - CUCM 7.0 to CUBE through ASA, H.323

I'am looking for some advice on faxing. The network will consists of two CUCM 7.0 servers with a CUBE gateway sitting behind an ASA. There is no ATA's being used, everything will be pots with use of VG224's. Currently I have all internet calls using G.711 and all calls to the CUBE will be G.729. What fax method can I use? Can I use fax-relay? Thanks